Abstract:Shallow geothermal energy is a kind of renewable energy; it has the characteristics of large reserves, wide distribution, shallow buried depth and easy development. In the situation of traditional energy resources shortage and environment pollution deterioration, development and utilization of shallow geothermal energy has important significance for global low carbon economy, energy saving and emission reduction. Groundwater source heat pump occupies an important position because of its high utilization rate, low cost, easy repairing; and the water well is the key in the system, the project quality directly affects the system running, reinjection and service life. By a large amount of survey, the outstanding problems of water well in the construction are analyzed, and based on the tests and practical experience, reasonable water well construction technologies are put forward.

Abstract:The hole-wall stability is one of the focuses of deep-hole geological core drilling. The accurate prediction of formation pore pressure, in-situ stress state, formation collapses pressure and fracture pressure before drilling are vital to conduct quality, safe, efficient and low-cost drilling. These are the design basis of the hole-wall structure, casing program and strength, density and rheological properties of drilling fluids. Based on the hole-wall stability, discussion is made on the existing problems of hole-wall structure, casing program, drilling tool assembly, drilling equipment in deep-hole geological core drilling and suggestions are put forward for the improvement.

Abstract:The replacement resource prospecting of copper, lead and zinc mine was made in Jiangxi. The paper summed up the drilling technology of medium-length inclined hole in tunnel about drilling tool selection, drilling chamber, borehole structure, drilling tool grading, drilling parameter, washing fluid and drilling bit parameter.

Abstract:The paper introduced the application of large diameter diamond wire-line coring drilling tool in complex formation of Fengtai ore field and the construction process. According to the problems of collapsing and block falling in borehole, low construction efficiency, difficult coring and low quality of construction, with the effective measures of drilling method, borehole structure, borehole protection, drilling parameter, reducing resistance by lubrication and drilling tool grading, the efficiency of drilling construction and engineering quality were improved.

Abstract:By the treatment of lost circulation and drilling fluid overflow in 61-21 well in Mawu formation, a typical gas well with small reserves and with the increasing of drilling fluid lost, two characteristics of higher formation pressure and overflow at wellhead while stopping pump were summed up. It is difficult to deal with the vicious circle of lost circulation, overflow, increase density and lost circulation again. Under the conditions of lost circulation and overflow, it is important to judge rapidly if the problem is in a gas well with small reserves; if it is, flat push killing well is an economical and effective method. The experiences and lessons from the combination of circulation & weight and flat push killing well methods in dealing with overflow of gas well with small reserves could be the reference to the similar wells.

Abstract:According to the frequent sticking accident in drilling construction, analysis was made on the causes and related factors. Sodium hydroxide solution was used as spotting fluid; the paper introduced the operation method and the effect.

Abstract:Construction difficulties of horizontal well cementing are analyzed, and horizontal well cementing technology and various measures in Daqing oilfield are introduced based on the Fan156-Ping158 well of Daqing oilfield. Fan156-Ping158 well is of a good quality, which becomes the reference to improving horizontal well cementing quality in oilfields.

Abstract:GL-4000 drill was introduced in the development premise, main structure and performance parameter and its main use was described. The machine can drill in variable positions depending on advanced hydraulic system with direct-operated load feedback fine-tuning and digital display device. Equipped with high-pressure injection pump, the drill can be used for variable rotary jet grouting construction, and with DTH hammer and simultaneous casing drilling tool the drill also can be used for simultaneous casing drilling.

Abstract:Based on the analysis on the adverse effects from solid and high solid content in slurry for core drilling, the comparison was made on the methods of lowering solid content. The paper introduced the self developed XZ series slurry purifying desander about the composition, structure parameters and the usage; and put forward the relevant suggestions on reasonable application of the slurry purifying desander in core drilling.

Abstract:In order to resolve the constant pressure and flow output problems of reciprocating pump, a kind of hydraulic pump with double-cylinder and single acting was designed. Hydraulic system of the pump is made up of 2 hydraulic pumps. The oil is supplied to the hydraulic system using double oil pump with oil mass distribution mode combining a unidirectional mechanism turning valve and an ordinary turning valve. The action of turning valve is controlled by the piston strokes and the action precision of valve is not under the influence of the changing of main hydraulic pump displacement. The system is controlled reliably with good result in practical application.

Abstract:A tool suitable to wire-line fishing in deep and dry hole and setting inner assembly was designed. The paper introduced the working principle and the structure composition of safe wire-line fisher and conveyor in deep hole. Study was made on the principle of mechanical control of inner tool and downhole releasing control, and the concrete methods of fisher downhole releasing were described. It was proved that fisher was applied with steady performance, convenient assembly and shorter time in handling accidents.

Abstract:The technical advantages of post-grouting for bored grouting pile are shorter length of pile, the bearing capacity improvement, less number of piles, good quality of pile foundation and the cost saving. Based on the engineering cases, the paper described the consolidation mechanism of compound post grouting for the end and the side of the pile, the empirical formula of bearing capacity, control points and control measures.

Abstract:By the construction technology combination of rotary drilling rig and positive circulation percussive drill, these two technologies took full advantages of fast construction speed in soil and rock, and the traditional rock-socket pile construction process was broken. Based on the successful case of hole completion in a pile foundation construction, the paper introduced these two technologies about the technical measures and the attentions.

Abstract:With the characteristics of high efficiency and economy, pre-stress anchorage technology is widely applied in all sorts of rock and soil reinforcement engineering. The opposed pre-stress steel bar reinforcement was used in 2# abutment of Gaojiazhuang. In the construction process, temporary reinforcing measures were used to ensure the abutment steady. Based on the analysis and discussion on the engineering practice, the construction procedure and methods were studied and summed up.

Abstract:In Jinping 1 hydropower station, because of large concrete surface of dam foundation, strict temperature control, short construction interval and the contradiction between consolidation grouting and concrete temperature control, both consolidation grouting without concrete covering and reinforced consolidation grouting with concrete covering were adopted. The paper analyzed and discussed the main problems of consolidation grouting without concrete covering.

Abstract:To reduce the stress concentration on the friction between aircraft wheel and road surface and reduce the channel pavement destruction by snow-clean vehicle, to prevent the dust produced in the friction of aircraft wheel and road joints from entering to aircraft engine and to prolong the service life of airport runway, all the exposed kerfs, edges and sharp corners in large airport field road should be chamfered. The study was made on the chamfering diamond saw blade and the chamfering construction technology, which was considerably valuable for domestic airport construction.

Abstract:There are often dozens of layers of dolomite body or bands embedded in oil shale formation in Qingshankou and Nenjiang group at Song Liao basin. While drilling in above mentioned oil shale formations, dolomite interlayers with relatively high hardness were often encountered. If ordinary tungsten carbide cutter drilling bit was used, not only the footage was too slow in drilling process, but also the bit was seriously damaged. To solve above drilling problems, the development of new drilling bit with high wear resistance and high penetration ability was eagerly needed. In this paper, a new type of teeth-shaped PDC bit was designed and manufactured. Field drilling experiments using these teeth-shaped PDC bits were conducted and their drilling performances were compared with those of tungsten carbide bits. The results indicated that the new teeth-shaped PDC bit demonstrated high rate of penetration, high wear resistance and long service life while drilling in oil shale formation containing dolomite interlayer. The technical and economical index of teeth-shaped PDC drill bit was better than that of conventional tungsten carbide cutter bits.

Abstract:With different design idea, improvement was made on matrix formula of traditional diamond bit by selecting high strength diamond and wear-resistance diamond polycrystalline and adjustment was made on the sintering parameters of traditional diamond bit. A large diameter reinforced diamond bit was developed, which has advantages over traditional diamond bit in wearing-resistance, anti-impact toughness and bit diameter retention. The bit service life in gravel and broken formations and drilling rate were improved with no changes of traditional drilling parameters.

Abstract:Take the engineering case of the 4th section supporting project of the north slope of a new plant of Hebei Steel Group, the paper introduced the application of supporting structure with pre-stressed anchor cable and hanging bolt net system in high rock side slope.

Abstract:The entrance of Dongchongli tunnel is located at Ⅴ class surrounding segment with the geological fracture development and abundant groundwater, and the tunnel was designed to construct on one side of the mountain body. As the side pressure was not be considered in the design, the fracture and sliding occurred at the side of the tunnel and the front slope during the tunnel construction; cracking and dislocation happened in the second grouted lined concrete in the borehole and the turning point appeared in situ monitoring data. By the study and analysis, it was determined that all these were caused by side pressure. According to the field situation, the analysis and evaluation were made on several schemes; by the comparison, slant grouting long pipe roof was adopted to solve the side pressure with satisfied effect.